Does anyone know why my zoanthids turned very unattractive brown colour. It was neon green when I placed them about halfway up my tank, about a year later they all changed to brown....why does this happen?
what test kit are you using, how old are the lights, TDS readings, origin of polyps and placement now. Green polyps are tough to brown out, from any region, so you have a problem JMHO. good luck
SG and ALK come to mind first. Lights second. Have you added anything new? Did something significant happen in the tank lately? Post your parameters including Mag.
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